Nobody believes the Seal of Solomon exists—nobody that is, but the dangerous organization, Vortex.
A sigil supposedly shows the way to the Seal, but all is not what it seems.
Abigail and Riley are on the case, but they discover an old enemy, and more.
Sigil is Book 5 in the Relic Hunter Taskforce series by USA Today Bestselling author, Ruth Hartzler.
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