Peter Grant Gets Amongst Our Weapons Quiz

Answer: Althea

The full title of the poem is "To Althea, from prison". As the book claims, this was recorded by Fairport Convention, back in 1973 on the album "Nine".
The best-known lines (to my mind) from this poem are:
"Stone walls do not a prison make,
Nor iron bars a cage"

In the context of the book, the first victim had been in the London Silver Vaults demanding that the store produce a ring that he believed his ex-wife, Althea had sold to them. Sudden, unexplained death followed, so the staff of the Folly get involved and the tale begins.

Answer: Platinum

The rings are interlocking puzzle rings which form into a sphere with inscriptions. The Folly is initially puzzled at the rings being made of platinum as Peter and Thomas are both under the impression that platinum has only been mined since the early twentieth century and the rings are clearly far older.

Answer: Lemon Scent

The concept of vestigia in the Rivers of London series is a term for the traces that magic leaves on surrounding surface. A related term is signare, which is a type of vestigia which can be considered the signature of a practitioner.

In this case when Peter inspects one of the rings he detects "lemon-scented dust and heard, as if a distant call to prayer, a lamentation in a foreign tongue. This time I got a greater sense of age, and over that a sharp crimson tinge like drops of blood in clear water."

The other three answers relate to the signare of recurring characters in the series. The tick tock of a clock is the magical signature of DCI Thomas Nightingale, Peter's boss and an enigma of a man.
The razor strop is indicative of the second faceless man, by this point in the series known to be Martin Chorley.
Seagulls are part of the signare of Lesley May, it relates to her hometown of Brightlingsea on the Essex coast. That has been the case so far in this book series, but later in this book her signare is described as including aspects of both the second faceless man and that of DCI Nightingale which reflects those who trained her.

Answer: George sent me

The Goblin market is a floating market, in the sense that the venue keeps changing. Described as "a combination mobile social club, shabeen and car boot sale for London's supernatural community", this one is held in Lloyd Square, Islington.

However, as events in this book indicate, the family running the Goblin Market are looking for a permanent site. This family is currently headed by Robin Goodfellow.

Answer: Portico Library, Manchester

Having recovered the book the rings were previously concealed in, Peter finds the words "Portico Library, Manchester" pencilled inside of the cover.

The Portico Library is a very real place in Manchester. Founded in the early nineteenth century, it currently shows on Google maps exactly as described in the novel, with a pub below it. From Peter's investigation it appears that the rings were taken from a hollowed-out book around 1989.

This scene also dates the setting of the story. The librarian at the Portico states that the book "was inventoried twenty-seven years ago - February 1989", hence we can conclude that the tale is set in 2016.

Answer: DCI Alexander Seawoll

At this point in the tale we get to find out more about the back story of DCI Seawoll. So far, we haven't had any of Professor Postmartin's history. Toby, the magic detecting dog resident in the Folly, was adopted by Peter in "Rivers of London", and what is known of Mrs Canal is that she was originally an orangutan who escaped from London Zoo and became the Genius Loci of the Regents Canal (and maybe all of the canals in London).

The "Sons of Wayland" have been referred to in previous books in the series, (but as Sons of Weyland). They used to be the engineering branch of the Folly. In particular, as blacksmiths they created staffs for practitioners. Their headquarters was destroyed in World War II and Thomas Nightingale believed they had disbanded. He was wrong.

Answer: Glotti

When introducing herself, the Goddess of the Glossop Brook, says "You can call me Brook or Glotti - depends on how old-fashioned you want to be". However this is after chastising DCI Seawoll for his vulgar language.

The other options are drawn from the other waters of the area. The Hurst Brook and Shelf Brook combine to form the Glossop Brook. This in turn is a tributary of the River Etherow. The River Etherow flows in to the River Goyt. Historically the confluence of these two rivers was the start of the River Mersey but now the Mersey is considered as starting at the confluence of the rivers Goyt and Tame.

Answer: Dragon Spear

The Grand Master is Grace Yutani, who, as well as being the Grand Master, describes herself as "current custodian of the archive of the Sons of Wayland and keeper of the true secret flame".

When Peter first sees the Grand master she is hammering at metal on one of the two anvils. It is the dragon spear, although she admits that in the absence of dragons it will work on fish.

Answer: Raven

These ghosts are hanging around on the moors that form the source of the Glossop Brook. That is a problem for Brook. She describes them as "Sad shadows condemned to walk the moors like a bad Morrissey song". All of these ghosts bar one are human. That one is a raven, probably German from its understanding of language.

The talking foxes believe that "any animal ghost stupid enough to hang around will be gobbled up by evil vampire cats."

Answer: Spanish Inquisition

On various surfaces close to the murder victims, a sigil is found scratched in to a surface. Initially the members of the Folly find the crude drawings puzzling, until Professor Postmartin finds a full picture of the sigil with the inscription quoted around the border.

Translated from Latin to English the quote becomes: "Arise, O God, judge thy own cause." The Spanish Inquisition, as DCI Seawoll said, "I wasn't expecting them."

This quote and the book title (along with the various section headings) all refer back to a well-known Monty Python sketch about the Spanish Inquisition.