This is book number 4 in the Amanda Lester series.
What does a dusty old secret have to do with peacocks?
Everything, as it turns out. When Amanda is knocked off her skateboard by a rare all-blue peacock, she learns that the species harbors a vital secret she must race to uncover. But before she can unravel the mystery, a startling archaeological discovery turns all of Britain against the detectives and threatens their very existence.
As old enemies gather strength and new adversaries emerge, Amanda finds herself dealing with hysterical teachers, a disappearing mentor, a mysterious poisoner, and a would-be magician. With so much at stake and so little time, the last thing she needs is to fall in love.